Rafael Diaz Diaz

US Patent:

51611546, Nov 3, 1992

Filed:

Feb 12, 1991

Appl. No.:

7/654146

Inventors:

Rafael J. Diaz - Hoffman Estates IL
Gary W. Grube - Palatine IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04J 316

US Classification:

370 951

Abstract:

A communication system (100) that varies the channel usage requirements of its communication resource assignment grant signals to accommodate the varying needs of communication units themselves as well as accommodating current loading conditions on an assignment resource.

US Patent:

54428092, Aug 15, 1995

Filed:

Mar 2, 1994

Appl. No.:

8/204797

Inventors:

Rafael J. Diaz - Hoffman Estates IL
Marc Naddell - Chicago IL
Gary W. Grube - Palatine IL
Robin Roberts - Oak Park IL
Michael D. Sasuta - Mundelein IL
Robert Adamczyk - Hawthorn Woods IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 738

US Classification:

455 541

Abstract:

A method is employed by a central controller of a radio communications system, which method provides for sustaining a predetermined level of communication service. The system includes a plurality of voice channels which are allocated among a plurality of subscribers (108-112) using a first control channel (102). In a preferred embodiment, at least one of the voice channels (104, 106) is also control-capable. The method includes evaluating (502) a current loading condition, and comparing (504) this loading condition with an upper loading threshold. Where appropriate, the controller assigns (506) one of the control-capable voice channels as a temporary control channel.

US Patent:

54230551, Jun 6, 1995

Filed:

Jun 29, 1993

Appl. No.:

8/084675

Inventors:

Rafael Diaz - Hoffman Estates IL
Masoud Bassiri - Streamwood IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 714
H04B 700
H04Q 728

US Classification:

455 15

Abstract:

A method to implement multiple talk-around communication links using the communication resources of one repeater. A system resource controller determines whether talk-around is possible for any two communication units intending to engage in a point-to-point communication link. Assignment of a talk-around repeater depends on the geographic locations of the two communication units, and a predetermined range criterion between them. In addition, the talk-around communication must not interfere with any existing talk-around communication already in the system. When talk-around communication is possible, an enabling communication grant is issued to the units, and the talk-around repeater's communication resources are assigned to support the link. Otherwise, a repeater for normal trunking is assigned.

US Patent:

52396789, Aug 24, 1993

Filed:

Nov 21, 1991

Appl. No.:

7/795588

Inventors:

Gary W. Grube - Palatine IL
Rafael J. Diaz - Hoffman Estates IL
Robert Adamczyk - Hawthorne Woods IL
Robin Roberts - Oak Park IL
Michael D. Sasuta - Mundelein IL

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04Q 900

US Classification:

455 341

Abstract:

A method (215) of converting a current control channel for use as a communication (voice/data) channel, in order to maintain a predetermined level of service in a radio communications system, employs a central controller (101) to allocate a limited number of communication channels among a plurality of subscriber units (108-112). After receiving (203) a request for a communication channel from one of a plurality of subscriber units (108-112), the controller (101) determines (205) whether all of the communication channels are busy. The controller then temporarily converts (215) the current control channel to a communication channel.